Buggy code:
@ SuppressWarnings ( "serial" ) public class ModifyStuffDialog extends Window implements ValueChangeListener { private static Logger logger = LogManager . getLogger ( ModifyStuffDialog . class . getName ( ) ) ; private StuffMgmtModel model ; private TmsUser user ; private boolean isNew ; private TextField usrnameField ; private TextField pwdField ; private Button newPwdButton ; private TextField codeField ; private TextField fNameField ; private TextField mNameField ; private TextField lNameField ; private TextField kelaField ; private TextField taxField ; private TextField addressField ; private TextField emailField ; private TextField mobileField ; private ComboBox managerField ; private CheckBox isLineManager ; private CheckBox isProjectManager ; private ComboBox secGroupField ; private Button saveButton ; private Button cancelButton ; private Label errorNote ; private boolean usrnameWasChanged ; private boolean pwdWasChanged ; private boolean codeWasChanged ; public ModifyStuffDialog ( StuffMgmtModel model ) { } protected ModifyStuffDialog ( StuffMgmtModel model , TmsUser user ) { } private void initView ( ) { } private Component getErrorBar ( ) { } private Component getStuffView ( ) { } private void dataToView ( ) { if ( ( user ) != null ) { if ( ( user . getAccount ( ) ) != null ) { usrnameField . setValue ( user . getAccount ( ) . getUsrName ( ) ) ; } else { <START_BUG> ModifyStuffDialog . logger . error ( ( "TmsAccount<seq2seq4repair_space>is<seq2seq4repair_space>null<seq2seq4repair_space>for<seq2seq4repair_space>" + ( user ) ) ) ; <END_BUG> } kelaField . setValue ( user . getKelaCode ( ) ) ; taxField . setValue ( user . getTaxNumber ( ) ) ; addressField . setValue ( user . getAddress ( ) ) ; emailField . setValue ( user . getEmail ( ) ) ; mobileField . setValue ( user . getMobile ( ) ) ; if ( isNew ) { createCode ( ) ; } else { codeField . setValue ( user . getCode ( ) ) ; } fNameField . setValue ( user . getFirstName ( ) ) ; mNameField . setValue ( user . getMidName ( ) ) ; lNameField . setValue ( user . getLastName ( ) ) ; if ( ( model . getToShowFilter ( ) ) != ( SupportedFunctionType . PERSONNEL_OWN ) ) { setupCombo ( ) ; isLineManager . setValue ( user . isLineManager ( ) ) ; isProjectManager . setValue ( user . isProjectManager ( ) ) ; } usrnameWasChanged = false ; pwdWasChanged = false ; codeWasChanged = false ; } else { ModifyStuffDialog . logger . error ( "TmsUser<seq2seq4repair_space>is<seq2seq4repair_space>null.<seq2seq4repair_space>Shall<seq2seq4repair_space>be<seq2seq4repair_space>NOT<seq2seq4repair_space>null." ) ; } } private void setupCombo ( ) { } private void viewToData ( ) { } private void validateUI ( ) { } private Component getBottomBar ( ) { } private boolean isValid ( ) { } private void clearErrorField ( ) { } private void showErrorField ( AbstractField field ) { } private void showErrorField ( AbstractField field , String errMsg ) { } @ Override public void valueChange ( ValueChangeEvent event ) { } private String creatrePassword ( ) { } private void createUsrname ( ) { } private boolean isUniqueUsrname ( ) { } private void createCode ( ) { } private boolean isUniqueUserCode ( ) { } }

Fix:
ModifyStuffDialog . logger . debug ( ( "TmsAccount<seq2seq4repair_space>is<seq2seq4repair_space>null<seq2seq4repair_space>for<seq2seq4repair_space>" + ( user ) ) ) ;